fix(docs-infra): add cookie consent gtag event default state

This PR sets a default state for cookie consent of 'denied'. The other part of the PR exists in the angular/dev-infra repo which will grant permission when the user accepts the cookie banner.

adev/src/app/core/services/analytics/analytics.service.ts

@@ -64,6 +64,19 @@ export class AnalyticsService {
  window.gtag = function () {
  window.dataLayer?.push(arguments);
  };
+
+ // Cookie banner consent initial state
+ // This code is modified in the @angular/docs package in the cookie-banner component.
+ // Docs: https://developers.google.com/tag-platform/security/guides/consent
+ window.gtag('content', 'default', {
+ ad_user_data: 'denied',
+ ad_personalization: 'denied',
+ ad_storage: 'denied',
+ analytics_storage: 'denied',
+ personalization_storage: 'denied',
+ wait_for_update: 500
+ });
+
  window.gtag('js', new Date());
 
  // Configure properties before loading the script. This is necessary to avoid